Hi, don't worry, it is natural to have dark skin in vaginally region and in between the buttocks..
It occurs due to certain hormonal changes as u grow..
However, there are certain reasons for excessive darkness like infection , use of hair removal cream,hormonal imbalance among others..
So, visit a gynecologist and get yourself checked..have a second opinion whether it is
really excessive darkness and rule out infections..
Next Steps
avoid wearing tight underwear
Health Tips
u can use potato slices for lightened skin as used for armpits..